** We are unable to provide private technical support for APM/GPS because the configuration is not easy (full features but not easy to use, sometime you need a soldering gun to work with). So please purchase APM/GPS only if you know how to configure. You are recommended to google and seek helps on forums. Thank you for your kind attention.

** The pins of the USB Connector soldered on the APM PCB are thin and weak. So you must be careful when you plug and unplug the USB (be gentle). We test all APM one by one manually with Mission Planner and make sure it is in good working condition (included USB) before sending out. So if you break the pins (push/pull too hard), you need to either solder the pins by yourself or send it back to us, we help you to solder the pins. No replacement or refund will be offered for the matter of USB.